Means for converting rotary into reciprocating motion and vice versa



Sept. 17, 1929. c. BAXTER 1,728,716

"BANS FOR CONVERTING ROTARY INTO RECIPROCATING MO'iI QN AND VICE VERSA Filed May 21. 1927- WLTInuAeA. I In vent/0r.

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Patented Sept. 17, 1929 UNITED STATES PATENT OFFICE CHARLES BAXTEIt, OF CLAPHAM, LONDON, ENGLAND MEANS FOR CONVERTING ROTARY INTO RECIPROCATING MOTION AND VICE VERSA Application filed. May 21, 1927, Serial No. 193,334, and in Great Britain June 2, 1926'.

This invention relates to improved means ":or converting reciprocating into rotary motion and vice versa and means in steam and heavy oil engines where the motive power is directly or indirectly applied from a piston and thence to a piston rod and finally through a connecting rod to the crank pin or the equivalent.

hen the piston is at either end of the stroke, the axis of the connecting rods coincides with that of the piston, thus forming what is known as the dead point; it therefore follows, especially in respect to steam or heavy oil engines in which practically the 7 maximum force is exerted upon thepiston at the commencement of the stroke, that much dissipation of useful energy occurs, because until the crank pin is carried by some extraneous agency out of the axial line the entire force is absorbed by the crank pin and is therefore during this period of the stroke incapable of imparting rotary motion thereto.

By my present invention I seek to remedy the defects above indicated anfld construct mechanism for converting reciprocating motion into rotary motion or vice versa from or to the piston comprising a connecting rod pivotally attached to the piston rod at one end and to the crank pin at the other, the

outer end of the connecting rod being furnished with opposed lateral extensions, the extension on one side being pivotally connected to the crosshead at a point awayffrom .1 its longitudinal axis so as to be capable only of substantially lateral movement in relation to the piston rod, the extension on the other side being pivotally connected to a link which in turn is pivoted to the piston rod so as to permit of movement of that extension of the connecting rod in a direction substantially parallel to the direction of the stroke.

In order that'my invention may be better understood and successfully carried out, I will now proceed to describe the same in reference to the appended sheet of drawing showing (in elevation) an embodiment of my invention in which a piston rod with crossheads is employed.

The accompanying drawing demonstrates pivoted to the slide block a and link cl being i pivoted also to the slide block, but in the axis of the piston rod 6. Link 0 is vertically disposed at a suitable angle and the other link d is substantially horizontal, so that the left hand portion 7 (as shown) of the T-shaped piece is constrained to move substantially horizontally with regard to the piston axis and thus receives the main thrust, while the right hand portion moves substantially in a parallel line to that of the stroke. The re sult is apparent that the large end of the connecting rod 6 at a point in the axis thereof which coincides with the axis of the crank pin 9 swings relatively to the small end about a vertical centre approximately at a point it which lies on that side of the thrust line C--D at an early part of the driving-stroke to the right. v

The arrangementsabove described can be readily applied to an existing engine, machine, pump or the like of ordinary C011",

struction with very little alteration, and nueral arms at the outer end, a pivot pin secured to each arm, a link mounted onto each of said pivot pins, a piston, a piston rod attached to said piston and connected to one of said links down through its longitudinal axis, and means for connecting the'second mentioned link out of the longitudinal axis.

2. Means for converting reciprocating motion into rotary motion and vice versa comprising a connecting rod formed with a T- shaped outer end a crankshaft associated with said connecting rod, two links pivotally connected to the outer end of said rod, a piston, a piston rod secured thereto, said rod connected to one of said links down through the longitudinal axis of the piston, and a crosshead connected to said piston rod and the second mentioned link being pivotally connected to the crosshead out of the longitudinal axis.

In Witness whereof I aflix my signature. CHARLES BAXTER. 

